This is an oral communication activity appropriate for EFL learners in elementary/primary school. (It's optimal for grades 3-6). This game is designed for practicing "shopping" dialogues and vocabulary.
Materials: "produce" and play money.
Object of Game:  To accumulate as many products as possible. Students are divided into clerks and shoppers. The clerks set up "stands" to allow easy access for all shoppers (e.g. around the outsides of the room with their backs to the wall). The shoppers are given a set amount of money* (e.g. dollars, euros, pounds, etc.) and begin at a stand where there is an open space. Students shop, trying to accumulate as many items as possible (each item is 1 unit of currency). Periodically, the instructor will say "stop" (a bell or other device may be needed to attract attention in some cultural and classroom contexts) and call out a name of one of the products. Students with that product must then put ALL their products in a basket at the front of the room. The remaining students continue shopping. Students who had to dump their products must begin again from scratch (with fewer units of currency). The student with the most products at the end wins. Students then switch roles. *It is recommended giving students as much money as possible since students who run out can no longer participate.
Alternative play for more advanced students: Clerks set the price of items. Shoppers have the option of negotiating the price. There are two winners in this version: The shopper who accumulates the most products and the clerk who makes the most money.